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[docs] Coverage: Document the profile merge pool specifier 

llvm-svn: 272604
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Vedant Kumar 2016-06-14 00:42:12 +00:00
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commit f3300c9f74
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8
clang/docs/SourceBasedCodeCoverage.rst
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@ -78,6 +78,14 @@ directory structure will be created. Additionally, the following special
* "%h" expands out to the hostname of the machine running the program.
* "%Nm" expands out to the instrumented binary's signature. When this pattern
is specified, the runtime creates a pool of N raw profiles which are used for
on-line profile merging. The runtime takes care of selecting a raw profile
from the pool, locking it, and updating it before the program exits. If N is
not specified (i.e the pattern is "%m"), it's assumed that ``N = 1``. N must
be between 1 and 9. The merge pool specifier can only occur once per filename
pattern.
.. code-block:: console
# Step 2: Run the program.